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Pàgina inicial > Articles > Articles publicats > Selective Laser-Assisted Synthesis of Tubular van der Waals Heterostructures of Single-Layered PbI2 within Carbon Nanotubes Exhibiting Carrier Photogeneration |
Data: | 2018 |
Resum: | The electronic and optical properties of two-dimensional layered materials allow the miniaturization of nanoelectronic and optoelectronic devices in a competitive manner. Even larger opportunities arise when two or more layers of different materials are combined. Here, we report on an ultrafast energy efficient strategy, using laser irradiation, which allows bulk synthesis of crystalline single-layered lead iodide in the cavities of carbon nanotubes by forming cylindrical van der Waals heterostructures. In contrast to the filling of van der Waals solids into carbon nanotubes by conventional thermal annealing, which favors the formation of inorganic nanowires, the present strategy is highly selective toward the growth of monolayers forming lead iodide nanotubes. The irradiated bulk material bearing the nanotubes reveals a decrease of the resistivity as well as a significant increase in the current flow upon illumination. Both effects are attributed to the presence of single-walled lead iodide nanotubes in the cavities of carbon nanotubes, which dominate the properties of the whole matrix. The present study brings in a simple, ultrafast and energy efficient strategy for the tailored synthesis of rolled-up single-layers of lead iodide (i. e. , single-walled PbI nanotubes), which we believe could be expanded to other two-dimensional (2D) van der Waals solids. In fact, initial tests with ZnI already reveal the formation of single-walled ZnI nanotubes, thus proving the versatility of the approach. |
Ajuts: | Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-581 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1086 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Economía y Competitividad SEV-2015-0496 Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2017-86616-R Ministerio de Economía y Competitividad ENE2017-89210-C2-1-R |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Anions ; Carbon nanotubes ; Materials ; Irradiation ; Lasers |
Publicat a: | ACS nano, Vol. 12, Issue 7 (July 2018) , p. 6648-6656, ISSN 1936-086X |
Postprint 34 p, 881.6 KB |